<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
	/**
	 * Authenticates a user.
	 * The example implementation makes sure if the username and password
	 * are both 'demo'.
	 * In practical applications, this should be changed to authenticate
	 * against some persistent user identity storage (e.g. database).
	 * @return boolean whether authentication succeeds.
	 */
	public function authenticate()
	{
        $admin = Admin::model();
        $criteria = new CDbCriteria();
        $criteria->select = 'admin_name, admin_pass';
        $criteria->addCondition('admin_name=:adminName');
        $criteria->params[':adminName'] = $this->username;
        $adminUser = $admin->find($criteria);

        // 如果存在用户名
        if(!$adminUser->admin_name)
            $this->errorCode = self::ERROR_USERNAME_INVALID;
        else if($adminUser->admin_pass != sha1($this->password))      // 密码错误
            $this->errorCode = self::ERROR_PASSWORD_INVALID;
        else
            $this->errorCode = self::ERROR_NONE;

        return !$this->errorCode;
	}
}